Binding a view or query to list\table

Question

Hi,
Using NetBeans 6.1
I managed to easily connect tables to a jTable element, but fail to connect to table (or list) a view or a free sql query. I'm working with MySQL and NB6.1.
What is the procedure to do the above?

Answer 1

t_ras wrote:
The main problem in creating business classes with the data is that I can't load the whole of the DB to classes, there are many related types of them and also a lot of rows.
So here you have to deice:
1) load the whole DB at once on load - then you work fast and have all in business classes easy to work with, but then it will be a mess updating back on save since you don't know what has change and you need to get derty with transactions and such creatures.
2) Work with data "on demand" - forget classes, just put in GUI the data you need. works fast all the time, less problems with transactions issues and enables wasy work with row locking. Then updating you need a very understandable code which probably has bugs, since it is not business logic oriented code, but DB structure oriented.Your thinking is wrong.
1. Just because there are relations between business objects doesn't mean you have to load all of them into memory when one is selected. You can, for example, do "lazy" fetches, and retrieve related business objects the first time you navigate the relationship.
2. All interactions with a database should take place within transactions -- there is nothing "dirty" about using transactions.
3. Working with data "on demand", if I can guess what that ought to mean, doesn't imply throwing OOP design principles out the window.
I think you need to learn about a persistence framework, like Hibernate . Many of the things you worry about, like " will be a mess updating back on save since you don't know what has change" are cleanly solved by it.